Stuart Hacking

Have a look at this documentation for a VerifyEvent in SWT:

void VerifyListener() {…}.verifyText(VerifyEvent e)
Sent when the text is about to be modified.

A verify event occurs after the user has done something to modify the text (typically typed a key), but before the text is modified. The doit field in the verify event indicates whether or not to modify the text.

Wait, what?

What we basically want is a simple predicate function that returns true if the Contents of a Text Field are still valid after a change. What SWT gives us is this awkward event model where we have to modify the event that has just been generated. (In my opinion, events should be immutable, since they represent a historical occurence.) Next SWT will have a peek in the event to see how to proceed.

SWT is full of weird bagbiters like this.

Programming Programming, Rant